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Difference between revisions of "cpp/numeric/ratio/ratio not equal"

From cppreference.com
< cpp‎ | numeric‎ | ratio
m (Text replace - "constexpr bool" to "inline constexpr bool")
m (-`inline`: CWG2387; fmt.)
 
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{{cpp/title | ratio_not_equal}}
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{{cpp/title|ratio_not_equal}}
 
{{cpp/numeric/ratio/navbar}}
 
{{cpp/numeric/ratio/navbar}}
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{{dcl begin}}
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{{ddcl|header=ratio|since=c++11|1=
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{{dcl header | ratio}}
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{{dcl | 1=
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template< class R1, class R2 >
 
template< class R1, class R2 >
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struct ratio_not_equal : std::integral_constant;
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struct ratio_not_equal : std::integral_constant<bool, /* see below */> { };
 
}}
 
}}
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{{dcl end}}
 
  
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If the ratios R1 and R2 are not equal, provides the member constant {{tt|value}} equal {{c|true}}. Otherwise, {{tt|value}} is {{c|false}}.
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If the ratios {{tt|R1}} and {{tt|R2}} are not equal, provides the member constant {{c|value}} equal {{c|true}}. Otherwise, {{c|value}} is {{c|false}}.
  
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=== Helper variable template ===
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===Helper variable template===
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{{ddcl | since=c++17 | 1=
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{{ddcl|since=c++17|1=
 
template< class R1, class R2 >
 
template< class R1, class R2 >
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inline constexpr bool ratio_not_equal_v = ratio_not_equal<R1, R2>::value;
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constexpr bool ratio_not_equal_v = ratio_not_equal<R1, R2>::value;
 
}}
 
}}
  
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{{cpp/types/integral_constant/inherit | {{c|1=R1::num != R2::num {{!!}} R1::den != R2::den}} }}
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{{cpp/types/integral_constant/inherit|{{c|1=R1::num != R2::num {{!!}} R1::den != R2::den}}}}
  
 
===Possible implementation===
 
===Possible implementation===
 
{{eq fun
 
{{eq fun
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| 1=
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|1=
 
template< class R1, class R2 >
 
template< class R1, class R2 >
 
struct ratio_not_equal : std::integral_constant <
 
struct ratio_not_equal : std::integral_constant <
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===Example===
 
===Example===
 
{{example
 
{{example
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|
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|code=
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| code=
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#include <iostream>
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#include <ratio>
 
#include <ratio>
  
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int main()
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static_assert(std::ratio_not_equal_v<std::ratio<6, 9>, std::ratio<9, 6>>, "6/9 != 9/6");
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{
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    if(std::ratio_not_equal<std::ratio<2,3>, std::ratio<1,3>>::value) {
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int main() {}
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        std::cout << "2/3 != 1/3\n";
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    } else {
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        std::cout << "2/3 == 1/3\n";
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    }
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}
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| output=
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2/3 != 1/3
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}}
 
}}
  
 
===See also===
 
===See also===
 
{{dsc begin}}
 
{{dsc begin}}
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{{dsc inc | cpp/experimental/type_traits_v | ratio_not_equal}}
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{{dsc inc|cpp/numeric/ratio/dsc ratio_equal}}
 
{{dsc end}}
 
{{dsc end}}
  
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[[de:cpp/numeric/ratio/ratio not equal]]
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{{langlinks|de|es|fr|it|ja|pt|ru|zh}}
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[[es:cpp/numeric/ratio/ratio not equal]]
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[[fr:cpp/numeric/ratio/ratio not equal]]
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[[it:cpp/numeric/ratio/ratio not equal]]
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[[ru:cpp/numeric/ratio/ratio not equal]]
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[[zh:cpp/numeric/ratio/ratio not equal]]
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Latest revision as of 14:42, 24 September 2024

 
C++
 
Metaprogramming library
Type traits
Type categories
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(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
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(C++11)
(C++11)
(C++11)
(C++11)
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Type properties
(C++11)
(C++11)
(C++11)
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(C++11)
(C++17)
(C++23)
(C++11)
(C++11)
(C++11)
(C++11)(until C++20*)
(C++11)(deprecated in C++20)
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(C++20)
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Type trait constants
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Type modifications
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(C++11)
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(C++11)
(C++11)
(C++20)
(C++11)
(C++11)(until C++20*)(C++17)
(C++20)
Compile-time rational arithmetic
Compile-time integer sequences
(C++14)
 
Compile time rational arithmetic
(C++11)
Arithmetic
(C++11)
(C++11)
(C++11)
(C++11)
Comparison
(C++11)
ratio_not_equal
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
 
Defined in header <ratio>
template< class R1, class R2 >
struct ratio_not_equal : std::integral_constant<bool, /* see below */> { };
 (since C++11)

If the ratios R1 and R2 are not equal, provides the member constant value equal true. Otherwise, value is false.

Contents

[edit] Helper variable template

template< class R1, class R2 >
constexpr bool ratio_not_equal_v = ratio_not_equal<R1, R2>::value;
 (since C++17)
[edit]

Inherited from std::integral_constant

Member constants

value
[static]
 true if R1::num != R2::num || R1::den != R2::den, false otherwise
(public static member constant)

Member functions

operator bool
 converts the object to bool, returns value
(public member function)
operator()
(C++14)
 returns value
(public member function)

Member types

Type Definition
value_type bool
type std::integral_constant<bool, value>

[edit] Possible implementation

template< class R1, class R2 >
struct ratio_not_equal : std::integral_constant <
                              bool,
                              !std::ratio_equal<R1, R2>
                         > {};

[edit] Example

Run this code
#include <ratio>
 
static_assert(std::ratio_not_equal_v<std::ratio<6, 9>, std::ratio<9, 6>>, "6/9 != 9/6");
 
int main() {}

[edit] See also

(C++11)
 compares two ratio objects for equality at compile-time
(class template) [edit]
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